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Editorial Team
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Asked: 2026-05-27T04:38:30+00:00

Trying to output a pointer’s address in decimal form using the %zu conversion specifier.

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Trying to output a pointer’s address in decimal form using the %zu conversion specifier. Runs okay as expected except that GCC warns

format ‘%zu’ expects type ‘size_t’, but argument 4 has type ‘long int *’

GCC options used are shown in the question. GCC still warns without any options set (other than -std=c99). clang however, does not issue any warnings at all with the same options. This is on OS X 10.7. Just curious why clang isn’t issuing any warnings? Is GCC “better” than clang for debugging/compiling?

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1 Answer

  1. Editorial Team

    This appears to be specific to the z size modifier in clang; you do get a warning with %lu, %u, %hu, etc. (Even without any options)

    Generally speaking, it has been my experience that clang has more useful warning messages than GCC does. This is an exception to that experience. I’ll file a bug.

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